It is called the diction.
Angst, in writing, is like a dark story. One that has a sad, dark, etc. plot to it. On the other hand, tone is how a writer feel towards a topic.
I would say that the best answer would be the last one.
Tone is dependent on the attitude of the author or viewpoint character toward the events of the story
Answer:
I think that the princess sent her lover to the lady because she loved him too much to see him die. We can see this from her fears about the lover being torn apart and because we know how much she loved him.
China has the highest at 1.42 billion.